singleton



T. F. SINGLETON.

MACHINE FOR FACING VALVE SEATS.

APPLICATION FILED JUNE 17. 1918.

1 ,321,855; Patented Nov. 18, 1919.

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Wham msflSz'ia y dfiiarz 41% v dim/3" T. F. SINGLETON.

MACHINE FOR FACING VALVE SEATS.

APPLICATION FILED JUNE 17. 1918.

1,3? 1,855. Pfitented Nov. 18, 1919.

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2720772 acs'l'd'z'iiyirim THOMAS FOWLER SINGLETON, or EDMONTON, ALBERTA,CANADA.

MACHINE FOR FACING VALVE-SEATS.

Application filed June 17, 1918.

To all whom it may concern:

Be it known that I, THOMAS FOW ER SINGLETON, a subject of the King ofGreat Britain, and resident of the city of Edmonton, in the Province ofAlberta, Dominion of Canada, have invented certain new and usefulImprovements in Machines for Facing Valve-Seats, of which the followingis a specification.

This invention relates to in'iprovements in machines for facing valvesand the objects of the invention are to facilitate mounting the machineon the valve chest without the necessity of removing the valve seat andso be able to face the seat when in position, to permit of the machinebeing adjusted to suit valves of different diameters thus giving to themachine a large range within which it can be advantageously employed andto permit of the cutting bar of the machine being readily brought intoalinement with the valve seat and so held during the operation of facingthe valve seat without any possibility ofthe machine becoming displaced.

Further'objects are to control the feed of the cutting bar so that thedesired pressure between the cutting member and the face of the valvewill be maintained and chattering thus eliminated, while at the sametime there is no possibility of the tool dipping into the face of thevalvese'at and roughing the same, and generally to adapt the severalparts of the machine to better perform the functions required of them.

With the above and other objects in view, the invention consistsessentially of the improved construction particularly described and setforth in the following specification and accompanying drawings formingpart of the same.

In the drawings: j t Figure 1 is a front elevation of the improvedmachine. a

F 2 isa longitudinal "section of the up per portion of the machineshowing the mo 'ter bar in elevation.

Fig. 3is a plan view of the upper part of the l nachi'ne with the cutterbar removed.

ig. 4 is a front elevation of an alternative form of j aw-adjustingmechanism whereby the machine is centered on externally threaded valveeh'ests. l I

Fig. 5 is a plan view of the face plate showing the jaws slidablymounted therein. Like characters of ieferenee refer to like iiithe"several agar-es.

Specification of Letters Patent.

Patented Nov. 18, 1919.

Serial No. 240,360.

Referring to the drawings, A represents the improved machine comprisinga face plate 10 provided with an integral stem 11 threaded at the upperend and having a central bore 12 turned to a working fit for the cutterbar 13, the face plate being provided with a plurality of radiallyextending slots 14, the object of which will be made clear hereafter.

The cutter bar 13 is provided with a lower enlarged end 15 which formsthe cutting member, the opposite end 16 being squared to engage with thehand wheel 17 by means of which rotary motion is manually imparted tothe cutting bar.

This bar isprovided intermediate of its length with a plurality ofannular recesses 18 designed to be engaged by a pair of laterallydisplaceable keys 19 slidably mounted on top of the adjusting nut 20which makes threaded engagement with the upper end of n the stem 11.

The keys. 19 are held in place by a cover plate 21 which is positionedby means of screws 22 or the like, and when the keys are pressed intoengagement with one of the annular recesses 18 they prevent longitudinalmoving of the cutter bar 13 taking place, but permit of rotary motionbeing freely transmitted to the said cutter bar.

The slots 14 of the face plate 10 slidably support a plurality of jaws23 provided at the lower ends with downwardly extending tongues 24:, thesaid jaws being recessed in termediate of their length 'as shown at 25and provided at the upper end with an inner tapered wall or edge 26adapted to be engaged by the inverted conical member 27 whereby the jawsare pressed outwardly to permit of the tongues 24 being forced intoengagement and held frictionally against the inner periphery of a valvechest.

.The conical member 27 is slidablv mounted on the stem 11 and above thisconical member a lock nut 28 is threaded on the said stem so that byrotating the lock nut the conical member will be forced downwardly tospread the jaws 23.

The face plate 10 is also provided with a pair of peripheral projectingme1nbcrs29 with which the free ends of the chains b0 engage, the otherends of the chains being connected to the ends of the tension plate 31which is provided with a tension screw smearing threaded engagementtherewith.

Oii'the upper end of the tension screw a 33 should be kept in positionand not be rotated and to this end I provide a pair of guides 35 whichengage with the said crab andpass through the tension plate 31 ondiametrically opposite sides of the said tension screw.

In that form of the invention illustrated in Fig. 1, the invertedconical member 27 is dispensed with and a hood 2''? having an innerconical. wall is substituted therefor. This hood is fed downwardly underthe action of the lock nut 28 which is the facsimile 'of that describedwith reference to Fig. 2 and the jaws 23 which are slidably mounted inthe slots 11 of the face plate 10 are provided at the upperend withbeveled outer walls 26 which engage with the conical wall of'the hoodand so force the said jaws inwardly toward the center of the-face plate10.

When this machine is in use and say for instance that the. valve seat ofan ordinary water tap or steam valve is being faced, one of the chains30 is disengaged from the hook 29 and the cutting member 15 of thecutter bar 13 is introduced into the valve casing,

the cover of which has been removed. If the valve casing has beenthreaded internally it will be naturally true to the valve seat locatedtherein and in this case that form of the invention illustrated in Fig.is used.

The downwardly extending tongues 24 of the jaws 23 are located withinthe bore of the valve and the lock nut 28 is adjusted until the conicalmember 27 presses the jaws 23 radially outwardly until the said tonguesfrictionally engage with the inner periphery of the bore and so centerthe upper portion of the machine relatively to the valve or water tap..

In this position the cutting bar 13 is di rectly in alinement with thelongitudinal axis of the valve seat. The chain 30 which has beenprevously disengaged from the hook 29'is now engaged therewith and thetension screw 32 adjusted until the crab 33 engages with the lowercurvilinear wall of the valve casing thereby holding the machine in thedesired position.

The cutter bar 13 is now adjusted until the cutting member 15 just restson the valve seat to be faced whereupon the keys 19 are moved inwardlyto engage with one of the annular recesses 18 which is in alinementtherewith and the screws 22 of the plate 21 are tightened holding thekeys in position.

Rotary motion may now be imparted to the cutting bar 13 by means of thehand wheel 17 and to move the cutting member 1.3 against the valve faceit is only necessary to adjust the nut 20 which will feed the cuttingbar longitudinally.

It will thus be seen that the pressure cxerted on the face of the valvewill be such that while an eiiicient scraping and facing of the same canbe made by the cutting member 15 chattering will not take place nor willthe cuttin member dig into the said valve seat.

In some valves however, it is found that the cover may be threadedexternally so that the outer periphery of the bore is then true with thevalve seat and when such is the case that form of the invention shown inFig. l-

' relatively to the valve.

The tension plate and chains 30 are now arranged with] the free ends ofthe chains engaging the hooks 29 of the face )late 10 and the tensionscrew 32 is tightened to permit of the crab 33 engaging the outer wallof the valve casing and so securethe machine in position.

The operation of feeding the cutting member 15 against the valve seatand positioning the cutting bar 13 to control the longitudinal motion,is the same as has been described above so that it is not thoughtnecessary to further enlarge upon the same. From the above description,it will be seen that I have invented a portable machine for facing valveseats which is capable of being operated on a great range of sizes andtypes of valves, the jaws 23 being so constructed that they can beeasily adjusted while the cutting bar 13 can be moved longitudinally sothat one of the series of annular recesses 18 is engaged by the keys 19and whereby the depth to which the cutting bar 18 operates is given agreat range while the adjustment of the keys 19 and the nut 20 wherebythe feed of the cutting member 15 is controlled is readily accomplishedwith a minimum of labor and time.

As many changes could be made in the above construction and manyapparently widely different embodiments-of my invention within the scopeof the claims, constructed without departing from the spirit or scopethereof, it is intended that all matter contained in the accompanyingdrawings and specification shall be interpreted as illustrative and notin a limiting sense.

What I claim as my invention is:

1. A portable valve facing machine, comprising a face plate, a rotatablecutter bar provided with a plurality of annular recesses therein, acutting member at one end of the said bar, key means engaging with theannular recesses, designed to prevent longitudinal motion of the cutterbar, and clamping means coacting with the face plate.

2. A valve facing machine comprising a face plate, a cutting bar passingthrough the face plate having a cutting member 011 the end thereof,means for rotating the cutting bar, a tensioning plate, flexible memberscoacting with the tensioning plate designed to be adjustably secured to.the face plate and a tension screw coacting with the said plate.

3. A valve facing machine comprising a face plate, a cutting barextending through the said face plate, a cutting member on one end ofthe bar, means for rotating the bar, a

tension plate, flexible members connected to the tension plate adaptedto be adjustably secured to the face plate, a tension screw passingthrough the tension plate, and a crab secured to one end of the tensionscrew.

4. A valve facing machine comprising a face plate, a cutting barextending through the face plate, a cutting member at the end of thesaid bar, means for rotating the cutting bar, a tension plate, flexiblemeans connecting the tension plate to the face plate, an adjustablysupported crab and guide means carried by the crab coacting with thetension plate.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

THOMAS FOWLER SI NGLETON.

lVitnesses WILLIAM J. Yno, ANNA MGNABB.

